eliminating absNormPath

git-annex has been using MissingH's `abdNormPath` forever, but that's
unmaintained and possibly buggy, and doesn't work on Windows. I've been
wanting to get rid of it for some time, and finally did today, writing a
`simplifyPath` that does the things git-annex needs and will work with all
the Windows filename craziness, and takes advantage of the more modern
System.FilePath to be quite a simple peice of code. A QuickCheck test found
no important divergences from absNormPath. A good first step to making
git-annex not depend on MissingH at all.

And it fixed some weird behaviors on Windows like
`git annex add ..\subdir\file` not working.

Note that absNormPathUnix has been left alone for now.

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